Public bug reported:
Bug report — Kernel panic in __queue_work + cpuidle_enter_state (kernel
7.0.0-27-generic)
The system crashes and reboots spontaneously after a period of use with Firefox
open. The crash does not produce a visible panic screen — the system simply
restarts cleanly, as if a reboot command had been issued.
Crash analysis (from kdump/dmesg):
The crash occurs in __queue_work.part.0, triggered by a timer interrupt
(sysvec_apic_timer_interrupt) while the CPU is in an idle state
(cpuidle_enter_state). The disassembled code contains a UD2 instruction (<0f>
0b), which is the explicit BUG() macro in the kernel, indicating the kernel
itself detected an internal inconsistency and halted.
Call trace summary:
RIP: __queue_work.part.0+0x190/0x390
sysvec_apic_timer_interrupt
cpuidle_enter_state+0xca/0x700
delayed_work_timer_fn
__run_timers
run_timer_softirq
handle_softirqs
Environment:
Ubuntu 26.04 LTS (Resolute)
Kernel: 7.0.0-27-generic (issue not observed on 7.0.0-22-generic)
CPU: AMD Ryzen 7 5700X
GPU: XFX RX 7600 (amdgpu driver)
RAM: 32 GB
Desktop: GNOME on Wayland
Suspected regression: The issue was not observed on kernel 7.0.0-22-generic.
Testing is ongoing to confirm stability on the earlier kernel.
Crash dumps available: /var/crash/202607111201/
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-27-generic 7.0.0-27.27
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: wagner 7362 F.... wireplumber
/dev/snd/controlC0: wagner 7362 F.... wireplumber
/dev/snd/seq: wagner 7340 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Jul 11 12:11:52 2026
InstallationDate: Installed on 2026-04-23 (79 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
IwDevWlp6s0Link: Not connected.
MachineType: Gigabyte Technology Co., Ltd. B550M AORUS ELITE
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic
root=UUID=67cd9e19-bcef-4463-95ea-5dbdd9b6019e ro quiet splash
processor.max_cstate=1
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/14/2026
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: FHb
dmi.board.asset.tag: Default string
dmi.board.name: B550M AORUS ELITE
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrFHb:bd04/14/2026:br5.17:svnGigabyteTechnologyCo.,Ltd.:pnB550MAORUSELITE:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnB550MAORUSELITE:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:pfaB550MB:
dmi.product.family: B550 MB
dmi.product.name: B550M AORUS ELITE
dmi.product.sku: Default string
dmi.product.version: Default string
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2160423
Title:
Bug report — Kernel panic in __queue_work + cpuidle_enter_state
(kernel 7.0.0-27-generic)
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